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- W2273016773 abstract "In Portugal, olive mill wastewater (OMW) production is estimated at 100x10-350x10 m/year and constitutes an important seasonal pollution problem to be solved by the local olive oil industry. OMW is a dark liquid residue with high organic content composed mainly by sugars, tannins, polyphenols, polyalcohols, organic acids, proteins, pectins and lipids. Different treatments and disposal alternatives can be found in the literature in order to provide solutions for the OMW problem. OMW biological treatments with its simultaneous valorisation through the co-production of added-value products are one of the main approaches possible. The aim of this work is to evaluate the capability of several filamentous fungi to reduce the polluting characteristics of OMW and to produce extracellular enzymes. Under this study, strains of Trametes versicolor, Aspergillus ibericus, Aspergillus niger and Penicillium expansum were tested. Agitated batch fermentations were carried out at 27 oC for seven days using culture media prepared with different concentration (10, 50 and 100 %) of centrifuged OMW. Daily changes on the concentration of reducing sugars, protein, phenolic and aromatic compounds, COD, colour and pH were determined. Additionally, produced lipase, lignin and manganese peroxidase and laccase were followed. When 10 % of OMW was used, T. versicolor and A. ibericus were found to be the most effective strains, reducing OMW colour (30 and 55 %, respectively), aromatic compounds (16 and 39 %, respectively), phenolic compounds (55 and 37 %, respectively) and COD (55 and 39 %, respectively). In those same conditions, the maximum lipase activity was 108 U/L, 291 U/L, 77 U/L and 47 U/L for T. versicolor, A. ibericus, A. niger and P. expansum, respectively. For the oxidative enzymes, activity was only detected in fermentations conducted with T. versicolor maximum recorded activity was 12 U/L and 83 U/L for laccase and lignin peroxidise, respectively. When 100 % of OMW was used, A. ibericus reduced OMW colour and COD by 97 % and 45 %, respectively, but no reductions of aromatic and phenolic compounds were observed. In those conditions lipase produced by A. ibericus reached 2927 U/L." @default.
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- W2273016773 date "2010-10-01" @default.
- W2273016773 modified "2023-09-24" @default.
- W2273016773 title "Evaluation of filamentous fungi for the treatment of olive mill waste-waters" @default.
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